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(No Model.

G. W. GARDANIER.

TELEGRAPHIG RELAY.

No; 316,956. Patented May 5, 1885.

I 7"D UZUZ{ H I I I'I INVENTOR WITNESSES I ATTORNEY N. PETERS Phololllhugnphmr, Waxhlnglon. D, C.

UNITED STATES PATENT a OFFICE,

GEORGE W. GARDANIER, OF NEW YORK, N. Y.

TELEGRAPHIC RELAY.

SPECIFICATION forming part of Letters Patent No. 316,956, dated May 5, 1885. Application filed March 24, 1884. (No model.)

' a citizen of the United States, and a resident of New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Telegraph-Ra peaters, of which the following is a specificatlon.

The invention relates to an improvement in telegraph-repeaters for automatically repeating signals from one single circuit into another, and vice versa; and it consists, essentially, of

two ordinary Morse relays, their armatures closing their respective local circuits on the back contact, and two transmitters, each having a rear spring-contact and, adjacent to the upper side of the forward end of the lever, a fixed contact or one without spring-action.

In the accompanying drawing I illustrate my invention, and in said drawing T and T respectively denote the transmitters; B and B, respectively, the relays, and B B the local batteries. The lever of the armature T has upon its upper surface the insulated post A, upon which is secured one end of the circuitspring 0, the other end of which extends'beyond the rear end of the lever and terminates above the contact D. Upon the lower side of the'lever of transmitter T is applied a retractile spring, E, by which,when the line is idle, the rear end of the lever is depressed and the circuit-spring C thrown in contact with the stop D, this being the condition of the transmitter when open. The front end of the lever of transmitter T moves between the stops or contacts F G, and below said front end is the usual electro-magnet, f. The transmitter T is similar in all essential respects to the transmitter T, it being furnished with the circuitspring contact H on its rear end, the stationary stops I J, between which its front end moves, and the electro magnet K, by which it may be opened or closed. The transmitter T is supplied also with the usual retractile spring, L, and below the outer end of the circuit-spring H is a stationary stop, M. The relay B is the ordinary Morse relay, consisting of the electro magnet N and armature O, the upper end of which moves between the resting-contact and working-contact Q,which latter is on what is known as the back side of the armature.

The armature O is provided with a retractilc spring, S, by which it is retained'against the contact Q in the absence of a current through the electro-magnet N. The relay B is the same as relay R, and its various parts are denoted by the same letters primed, which represent portions of like name in the relay R. The locals are lettered, respectively, V, W, X, Y, m, and 1 the wire V passing from the stop F to one side of the electrormagnet K, that lettered 7 from the stop I to one side of the electro-magnet f, that lettered X from the an mature of transmitter T to the local battery B, and thence to the armature 0, while the wire Y extends from the armature of transmitter T to the local battery B, and thence to the armature O. The wire a: passes from the stop Q to the electro-magnetf, and the wire y from the stop Q to the electro-magnet K. The main line from, say, the east, lettered (it, connects with the circuit-spring C, and is continued thence by the wire I) to the electro-magnet N, and from that to the battery and earth by a wire, d. The main line to the west is in electrical connection with the circuit-spring H,

and also, when the transmitter T is closed, with the electro-magnet N, by means of the stop M and wire e. From the electro-magnet N a wire, 9, passes to the battery and earth. The electric impulses in thewire a during the transmission of signals from the east pass into the wireb through the spring 0 and stop D, and thence into the electro-magnet N and earth, the effect oftheir passage into the electro-magnet N being to operate the armature O, and to open-or close the local circuit consisting of the wires g V X, battery B, and electro-magnet K, which operates the transmitter T to make and break the main-line circuit at M and the local circuit of transmitter T at I, the effect being that the message transmitted over the wire afrom the east will be repeated into the Western circuit by the operation of the transmitter T. The relay Rbeing in the mainline circuit,which is opened at M by the movement of the transmitter T,would tend to close the local circuit of transmitter T at Q,were it not that this action has been prevented by the lever of transmitter T breaking the local circuit of transmitter T at the contact I. The transmitter T is thus prevented from interfering with the operation of repeating, which is being performed by the transmitter T.

The signals from the west will be repeated into the eastern circuit in the same manner as those from the east are repeated by the transmitter T into the western circuit, the two parts of the apparatus being duplicates. When the signals are from the west, the main-line circuit is through the wire e, electro-magnet N, and wire g,to the earth,while the local circuit is through wire YV, electro-magnetf, wire 00, local battery 13, and wire Y. The effect of the relay Rduring the transmission of signals from the west is the same as that of the relay R while messages are coming from the east. It would tend to close the local circuit of the transmitter T at Q,were this not pre vented bythe fact that the local circuit of said transmitter T has been just previously broken at F by the lever of transmitterT. During the movement of the transmitter T (and the same is true of transmitter T) the contact at F is permitted to be broken immediately before the main circuit at D is broken by reason of the circuit-spring O,Which will remain against the stop *1) until after the front end of vthe transmitter-lever has broken its contact with the stop F. It will thus be noted that one transmitter will not create a disturbance while the other is repeating.

What I claim as my invention, and desire to secure by Letters Patent, is

1. A telegraph-repeater consisting of a transmitter and relay for each of the main-line circuits with local circuits, the transmitters each 3 5 being arranged with contacts to directly break the local circuit of the other before the mainline circuit is broken,whereby one transmitter is kept idle while the other is operating, substantially as set forth.

2. In a telegraph-repeater, the relays, the armatures of which are arranged to close their respective local circuits on the back contact, in combination with the transmitters having a springcontact at one end and a fixed contact 4 5 at the other, and with local and main-line circuits, substantially as set forth.

3. Ina telegraph-repeater, the combination of thetransmittersTT, having circuit-springs G H, respectively,with local and main-line cir- 5o cuits and relays R R, whose armatures act on the back contact to close their respective local circuits, substantially in the manner described. 4. In a telegraph-repeater, the transmitter,

relays, and local and main-line circuits, the ar- 55 mature of the relays operating their respective transmitters on the back contact, and one ,end of each transmitter being in and adapted to open and close the local circuit ofthe other transmitter, substantially as set forth.

Signed at New York, in the county of New York and State of New York, this 20th day of- March, A. D1884.

GEORGE W. GARDANIEB.

W'itnesses:

OrrAs. O. GILL, HERMAN Gusrow. 

